Simple Machines Station One 1 st Class Levers This station should have 2 levers set up. One where the fulcrum is @.5m and one where it is @.65m. Don t change them in any way! You should also have Newton scale and a meter stick. Hooked Side = Input Weighted Side = Output A) Draw the levers in your notes and use the drawings to record your results. B) Record output force that the mass has on the lever. C) Record the input force. D) Calculate the AMA of each lever. E) Move the input side of each lever down (toward the ground) 10 cm. On the output side of lever, measure how far the weight moves up. F) How are the AMA you calculated (in D) and the ratios in distances measured (in E) related? G) Calculated the IMA for each lever. Are the same as the AMAs you calculated in D?
Simple Machines Station two 2 nd Class Levers This station should have 2 levers set up. One where the mass is @.5m and one where it is @.75m. Don t change them in any way! You should also have Newton scale and a meter stick. Hooked Side = Input Weighted Side = Output A) Draw the levers in your notes and use the drawings to record your results. B) Record output force that the mass has on the lever. C) Record the input force. D) Calculate the AMA of each lever. E) Move the input side of each lever up (toward the sky) 10 cm. On the output side of lever, measure how far the weight moves up. Do your numbers match? Why? F) How are the AMA you calculated (in D) and the ratio in distances measured (in E) related? G) Calculated the IMA for each lever. Are the same as the AMAs you calculated in D?
Simple Machines Station Three--Pulleys This station should have string, a ring stand, pulleys and Newton scales. Take extra care to not mess up the stringing of the pulleys. A) Look at the pictures below. Predict which set-up will require LESS pulling force on the string in order to get the mass to lift up off the table. B) For each set-up, measure the output force and the input force. C) For each set-up, measure the distance the mass is raised & the amount of cord pulled. How do these numbers relate to the AMSs calculated? C) Sketch the set-up of the 2 Newton scales and what they each read. Unhook the mass from the scales and find out what its weight s force is. Discuss with your group what this has to do with pulley Input Output A B C D
Simple Machines Station Rube Surf around for Rube Goldberg ideas & inspiration!!
Simple Machines--Station Six Screws and Wedges This station should have two screws, screwdrivers, boards, scissors paper, and tape. There should also be some examples of wedges A) Take the screws and write down what makes them similar and what makes them different. B) Predict which one will be easier to get to screw into the board. C) Screw each screw into the board. Record which one was easier to turn. D) Record which one went into the board faster. E) Calculate the IMA of the BIG bolt at this station. F) Cut a piece of paper just like the dashed-line figure below. Wrap it around a pencil. Record what happens, by either drawing the results or by describing this in words. Wedge A) Use the wedges that are at this station to do work. B) When would you use a wedge? This is like a ramp??? Now wrap it around a pencil Whoa! a screw!!!
Simple machines Station Seven Wheel and axle This station should have a K NEX wheel and axle elevator at it. There should be a big green wheel with a yellow axle A) Put the little blue peg in the black colored hole then crank up the 5N mass. Count the number of turns to lift the mass. Record. B) Next, put the little blue peg in the hole marked 1 to crank up the 5N mass. Count the number of turns to lift the mass. Record. WHY DO THESE NUMBERS TURN OUT THE WAY THEY DID?? C) Which one was easier to crank, the inner hole or the outer hole? Why might this be?? How do you know?? D) If the diameter of the axle at this station is.5cm, calculate the IMA of BOTH the big and small W&A systems. Why can you say that a W&A is truly a lever?
Simple machines Station Eight Take the online quizzes at the following sites! http://www.edinformatics.com/math_science/simple_machines/simple_machines_quiz. htm http://glencoe.mheducation.com/sites/0078778115/student_view0/unit6/chapter20/ma th_practice_2.html